I have a set of new leaf springs (5) leaf boat trailer or a 6000 lb axle utility trailer. 25 1/4’’from center to center of bolt hole . Also have a set of 7000 lb 5 leaf springs with brackets and u bolts for $65.00 same measurements. See pictures for more info the 3500 lb springs have been sold call or text 3 miles from Mt.Washington red light 502-432-300one.